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682 records returned

Multiferroicity in In-Containing Perovskites.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19918831 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - November 13, 2009 Category: Chemistry Authors: Alonso JA Tags: Chemphyschem Source Type: journals

Subsystem-Based Theoretical Spectroscopy of Biomolecules and Biomolecular Assemblies.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The absorption properties of chromophores in biomolecular systems are subject to several fine-tuning mechanisms. Specific interactions with the surrounding protein environment often lead to significant changes in the excitation energies, but bulk dielectric effects can also play an important role. Moreover, strong excitonic interactions can occur in systems with several chromophores at close distances. For interpretation purposes, it is often desirable to distinguish different types of environmental effects, such as geometrical, electrostatic, polarization, and response (or differential polarization) effects. Methods t...
Source: Chemphyschem - November 12, 2009 Category: Chemistry Authors: Neugebauer J Tags: Chemphyschem Source Type: journals

Preparation of Solvent-Free Gold Nanofluids with Facile Self-Assembly Technique.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19911406 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - November 12, 2009 Category: Chemistry Authors: Zheng Y, Zhang J, Lan L, Yu P, Rodriguez R, Herrera R, Wang D, Giannelis EP Tags: Chemphyschem Source Type: journals

Electrochemical Hydrogen Storage in Ti(1.6)V(0.4)Ni(1-x)Co(x) Icosahedral Quasicrystalline Alloys.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The discovery of the icosahedral phase (i-phase) in rapidly quenched Ti(1.6)V(0.4)Ni(1-x)Co(x) (x=0.02-0.1) alloys is described herein. The i-phase occurs in a similar amount relative to the coexisting beta-Ti phase. The electron diffraction patterns show the distinct spot anisotropy, indicating that the i-phase is metastable. The electrochemical hydrogen storage performances of these five alloy electrodes are also reported herein. The hydrogen desorption of nonelectrochemical recombination in the cyclic voltammetric (CV) response exhibits the demand for electrocatalytic activity improvement. A discharge capacity of 26...
Source: Chemphyschem - November 12, 2009 Category: Chemistry Authors: Hu W, Niu XD, Watada M, Kawabe Y, Wu YM, Wang LD, Wang LM Tags: Chemphyschem Source Type: journals

Self-Assembly of a Two-Dimensional Bimetallic Coordination Framework and Dynamic Control of Reversible Conversions to Homo-Metallic Hydrogen-Bond Arrays.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19911408 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - November 12, 2009 Category: Chemistry Authors: Shi Z, Lin N Tags: Chemphyschem Source Type: journals

Liquid Crystallinity and Supramolecular Organization of Regioisomeric Isatin Derivatives: An Experimental and Theoretical Study.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Spatially organized chromophores can be beneficial for advanced applications like for example, organic solar cells, laser technology or non-linear optic devices as well as supramolecular photochemistry. Of particular interest are non-static ordered forms of molecular organization as for example, liquid crystals. With this in mind we synthesised four new regioisomeric isatin derivatives by Suzuki-Miyaura coupling of 4-dodecyloxyphenylboronic acid with all four possible regioisomers of bromoisatin. Liquid crystalline properties are found for 5-(4-dodecyloxyphenyl)isatin, while the other regioisomers do not display a meso...
Source: Chemphyschem - November 12, 2009 Category: Chemistry Authors: Blunk D, Porada JH Tags: Chemphyschem Source Type: journals

Oxidation of CO Catalyzed by a Cu Cluster: Influence of an Electric Field.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Adsorption ability and reaction rate are two essential parameters that define the efficiency of a catalyst. Herein, we implement density functional theory (DFT) and report that CO can be oxidized by a pyramidal Cu cluster with an associated reaction barrier E(b)=1.317 eV. In this case, our transition state calculations reveal that the barrier can be significantly lowered after superimposing a negative electric field. Moreover, when the field intensity corresponds to F=-0.010 au, the magnitude of E(b)=0.698 eV is equivalent to-or lower than-those of typical catalysts such as Pt, Rh, and Pd. The superimposition of a posi...
Source: Chemphyschem - November 10, 2009 Category: Chemistry Authors: Liu W, Zhao YH, Zhang RQ, Li Y, Lavernia EJ, Jiang Q Tags: Chemphyschem Source Type: journals

Isotropic (13)C Hyperfine Coupling Constants Distinguish Neutral from Anionic Ubiquinone-Derived Radicals.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19904797 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - November 10, 2009 Category: Chemistry Authors: Boesch SE, Wheeler RA Tags: Chemphyschem Source Type: journals

Hierarchical Self-Assembled Nanostructures from the Organic n-Type Semiconductor Hexaazatrinaphthylene.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19904798 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - November 10, 2009 Category: Chemistry Authors: Gao B, Li J, Li M, Cheng Y, Wang L Tags: Chemphyschem Source Type: journals

Remote Sensitized Photoisomerization via Through-Bond Triplet-Triplet Energy Transfer Mediated by a Salt Bridge in a Supramolecular Dyad.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A supramolecular dyad, BP-(amidinium-carboxylate)-NBD is constructed, in which benzophenone (BP) and norbornadiene (NBD) are connected via an amidinium-carboxylate salt bridge. The photophysical and photochemical properties of the assembled BP-(amidinium-carboxylate)-NBD dyad are examined. The phosphorescence of the BP chromophore is efficiently quenched by the NBD group in BP-(amidinium-carboxylate)-NBD via the salt bridge. Time-resolved spectroscopy measurements indicate that the lifetime of the BP triplet state in BP-(amidinium-carboxylate)-NBD is shortened due to the quenching by the NBD group. Selective excitation...
Source: Chemphyschem - November 9, 2009 Category: Chemistry Authors: Han L, Wei H, Li S, Chen J, Zeng Y, Li YY, Han Y, Li Y, Wang S, Yang G Tags: Chemphyschem Source Type: journals

Inside Cover: Structural and Viscoelastic Properties of Actin Networks Formed by Espin or Pathologically Relevant Espin Mutants (ChemPhysChem 16/2009).Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19890838 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - November 3, 2009 Category: Chemistry Authors: Lieleg O, Schmoller KM, Purdy Drew KR, Claessens MM, Semmrich C, Zheng L, Bartles JR, Bausch AR Tags: Chemphyschem Source Type: journals

Spotlights on our sister journals: ChemPhysChem 16/2009.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Authors: PMID: 19890839 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - November 3, 2009 Category: Chemistry Tags: Chemphyschem Source Type: journals

Preview: ChemPhysChem 17/2009.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Authors: PMID: 19890840 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - November 3, 2009 Category: Chemistry Tags: Chemphyschem Source Type: journals

A Method to Explore Protein Side Chain Conformational Variability Using Experimental Data.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Experimentally measured values of molecular properties or observables of biomolecules such as proteins are generally averages over time and space, which do not contain su ffi cient information to determine the underlying conformational distribution of the molecules in solution. The relationship between experimentally measured NMR (3)J-coupling values and the corresponding dihedral angle values is a particularly complicated case due to its nonlinear, multiple-valued nature. Molecular dynamics (MD) simulations at constant temperature can generate Boltzmann ensembles of molecular structures that are free from a priori ass...
Source: Chemphyschem - October 30, 2009 Category: Chemistry Authors: Allison JR, van Gunsteren WF Tags: Chemphyschem Source Type: journals

Progress in Scanning Electrochemical Microscopy by Coupling with Electrochemical Impedance and Quartz Crystal Microbalance.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Scanning electrochemical microscopy (SECM) is a powerful technique for performing quantitative measurements at a local scale. This paper covers the development of combinations of SECM with electrochemical impedance spectroscopy (EIS) and electrochemical quartz crystal microbalance (EQCM). Basic aspects are described and potential applications reported by several research groups are covered. The unique advantages of the coupled techniques-with additional information being obtained from each coupling-are also discussed. PMID: 19882616 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 30, 2009 Category: Chemistry Authors: Keddam M, Portail N, Trinh D, Vivier V Tags: Chemphyschem Source Type: journals

Thermodynamics of Carbon Dioxide Adsorption on the Protonic Zeolite H-ZSM-5.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Adsorption of carbon dioxide on H-ZSM-5 zeolite (Si:Al=11.5:1) was studied by means of variable-temperature FT-IR spectroscopy, in the temperature range of 310-365 K. The adsorbed CO(2) molecules interact with the zeolite Brønsted-acid OH groups bringing about a characteristic red-shift of the O--H stretching band from 3610 cm(-1) to 3480 cm(-1). Simultaneously, the nu(3) mode of adsorbed CO(2) is observed at 2345 cm(-1). From the variation of integrated intensity of the IR absorption bands at both 3610 and 2345 cm(-1), upon changing temperature (and CO(2) equilibrium pressure), the standard adsorption enthalpy of...
Source: Chemphyschem - October 30, 2009 Category: Chemistry Authors: Armandi M, Garrone E, Areán CO, Bonelli B Tags: Chemphyschem Source Type: journals

Rational Design of Ag/TiO(2) Nanosystems by a Combined RF-Sputtering/Sol-Gel Approach.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The present work is devoted to the preparation of Ag/TiO(2) nanosystems by an original synthetic strategy, based on the radio-frequency (RF) sputtering of silver particles on titania-based xerogels prepared by the sol-gel (SG) route. This approach takes advantage of the synergy between the microporous xerogel structure and the infiltration power characterizing RF-sputtering, whose combination enables the obtainment of a tailored dispersion of Ag-containing particles into the titania matrix. In addition, the system's chemico-physical features can be tuned further through proper ex situ thermal treatments in air at 400 a...
Source: Chemphyschem - October 30, 2009 Category: Chemistry Authors: Armelao L, Barreca D, Bottaro G, Gasparotto A, Maccato C, Tondello E, Lebedev OI, Turner S, Van Tendeloo G, Sada C, Stangar UL Tags: Chemphyschem Source Type: journals

Visual Evidence for Formation of Water-in-Ionic Liquid Microemulsions.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19882619 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 30, 2009 Category: Chemistry Authors: Behera K, Malek NI, Pandey S Tags: Chemphyschem Source Type: journals

Acidity of Amorphous Silica-Alumina: From Coordination Promotion of Lewis Sites to Proton Transfer.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19882620 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 30, 2009 Category: Chemistry Authors: Chizallet C, Raybaud P Tags: Chemphyschem Source Type: journals

Highly Dispersed Pd Species Active in the Suzuki-Miyaura Reaction.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Structures of Pd/zeolites immersed in solvents were measured by in situ X-ray absorption fine structure (XAFS). Systematic studies revealed that the selection of an appropriate support (USY-zeolite), thermal treatment temperature of USY, solvent (o-xylene), H(2) partial pressure (6 %), and the use of a Pd amine complex affect the structure of Pd. As a result, we found that monomeric Pd can be obtained in the USY support with H(2) bubbling in o-xylene. The structural properties of Pd correlate well with its catalytic performance in the Suzuki-Miyaura coupling reactions; a very high TON of up to 11 000 000 was obtained o...
Source: Chemphyschem - October 28, 2009 Category: Chemistry Authors: Okumura K, Matsui H, Tomiyama T, Sanada T, Honma T, Hirayama S, Niwa M Tags: Chemphyschem Source Type: journals

Adsorbate-Induced Changes in Surface Potential of Gold Nanoparticles Revealed by Raman Spectroscopy.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19876995 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 28, 2009 Category: Chemistry Authors: Shin D, Kim K, Shin KS Tags: Chemphyschem Source Type: journals

Aryl Diazonium for Biomolecules Immobilization onto SPRi Chips.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A method for the immobilization of proteins at the surface of surface plasmon resonance imaging (SPRi) chips is presented. The technology, based on the electro-deposition of a 4-carboxymethyl aryl diazonium (CMA) monolayer is compared to a classical thioctic acid self-assembled monolayer. SPRi live recording experiments followed by the quantification of the diazonium surface coverage demonstrate the presence of a monolayer of electro-deposited molecules (11*10(12) molecules mm(-)(2)). This monolayer, when activated through a classical carbodiimide route, generates a surface suitable for the protein immobilization. In t...
Source: Chemphyschem - October 28, 2009 Category: Chemistry Authors: Mandon CA, Blum LJ, Marquette CA Tags: Chemphyschem Source Type: journals

Analysis of the Self-Assembly of 4x4 DNA Tiles by Temperature-Dependent FRET Spectroscopy.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Correct and efficient self-assembly of oligonucleotides into highly ordered superstructures essentially depends on the structural integrity and thermal stability of DNA motifs such as junctions or tiles that build up the superstructure. To investigate the assembly/disassembly process of DNA tiles, we recently described a microplate-based method employing Förster resonance energy transfer (FRET) spectroscopy, which enables the analysis of DNA superstructure formation in real time and with high throughput. This method allows thermodynamic parameters of the self-assembly process to be extracted, and we here apply it ...
Source: Chemphyschem - October 26, 2009 Category: Chemistry Authors: Saccà B, Meyer R, Niemeyer CM Tags: Chemphyschem Source Type: journals

Optical, Mechanical, and Opto-Mechanical Switching of Anchored Dithioazobenzene Bridges.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19856368 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 23, 2009 Category: Chemistry Authors: Turanský R, Konôpka M, Doltsinis NL, Stich I, Marx D Tags: Chemphyschem Source Type: journals

A High Molecular Weight Donor for Electron Injection Interlayers on Metal Electrodes.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The molecular donor 9,9'-ethane-1,2-diylidene-bis(N-methyl-9,10-dihydroacridine) (NMA) has been synthesized, and its electronic properties were characterized both in solution using cyclic voltammetry and optical absorption spectroscopy, and at interfaces to metals with photoelectron spectroscopy (PES). The optical energy gap of NMA in solution increases by 0.10 eV when the compound is doubly oxidized. On the basis of quantum-chemical calculations, this ipsochromic effect is rationalized by a change in geometry involving a severe torsion of the two acridinium moieties with respect to the central double bond, thus reduci...
Source: Chemphyschem - October 23, 2009 Category: Chemistry Authors: Bröker B, Blum RP, Beverina L, Hofmann OT, Sassi M, Ruffo R, Pagani GA, Heimel G, Vollmer A, Frisch J, Rabe JP, Zojer E, Koch N Tags: Chemphyschem Source Type: journals

X-Ray Diffraction as a Local Probe Tool.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
For the structural characterization of nanoscale objects, X-ray diffraction is widely used as a technique complementing local probe analysis methods such as scanning electron microscopy and transmission electron microscopy. Details on strain distributions, chemical composition, or size and shape of nanostructures are addressed. X-ray diffraction traditionally obtains very good statistically averaged properties over large ensembles-provided this averaging is meaningful for ensembles with sufficiently small dispersion of properties. In many cases, however, it is desirable to combine different analysis techniques on exact...
Source: Chemphyschem - October 23, 2009 Category: Chemistry Authors: Stangl J, Mocuta C, Diaz A, Metzger TH, Bauer G Tags: Chemphyschem Source Type: journals

Size-Dependence of Catalytic Activity of Gold Nanoparticles Loaded on Titanium (IV) Dioxide for Hydrogen Peroxide Decomposition.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19856373 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 23, 2009 Category: Chemistry Authors: Kiyonaga T, Jin Q, Kobayashi H, Tada H Tags: Chemphyschem Source Type: journals

Anomalous Preservation of CH(4) Hydrate and its Dependence on the Morphology of Hexagonal Ice.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19856374 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 23, 2009 Category: Chemistry Authors: Takeya S, Ripmeester JA Tags: Chemphyschem Source Type: journals

Active Metal Electrode-Oxide Interface in Gas Sensor Operation Probed by In Situ and Time-Resolved X-Ray Spectroscopy.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19856375 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 23, 2009 Category: Chemistry Authors: Gurlo A, Riedel R Tags: Chemphyschem Source Type: journals

Electrically Programmable Nematofluidics with a High Level of Selectivity in a Hierarchically Branched Architecture.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19856376 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 23, 2009 Category: Chemistry Authors: Na YJ, Yoon TY, Park S, Lee B, Lee SD Tags: Chemphyschem Source Type: journals

Theoretical Study on Hydrogen-Bond Effects in IR Spectra of High- and Low-Temperature Phases of Nitric Acid Dihydrate.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The low- and high-temperature phases (alpha and beta, respectively) of solid nitric acid dihydrate (NAD) are studied in depth by DFT methods. Each phase contains two types of complex structures (H(3)O(+))(H(2)O), designated A and B, with different hydrogen-bonding (HB) characteristics. The theoretical study reveals that type A complexes are weakly bound and could be described as (H(3)O)(+) and H(2)O aggregates, with decoupled vibrational modes, whereas in type B structures the proton is situated close to the centre of the OO bond and induces strong vibrational coupling. The proton-transfer mode is predicted at quite di...
Source: Chemphyschem - October 22, 2009 Category: Chemistry Authors: Martín-Llorente B, Fernández-Torre D, Escribano R Tags: Chemphyschem Source Type: journals

From Branched Networks of Actin Filaments to Bundles.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Cross-linking proteins can mediate the emergence of rigid bundles from a dense branched network of actin filaments. To enable their binding, the filaments must first bend towards each other. We derive an explicit criterion for the onset of bundling, in terms of the initial length of filaments L, their spacing b, and cross-linker concentration f, reflecting the balance between bending and binding energies. Our model system contains actin, the branching complex Arp2/3 and the bundling protein fascin. In the first distinct stage, during which only actin and Arp2/3 are active, an entangled aster-like mesh of actin filament...
Source: Chemphyschem - October 21, 2009 Category: Chemistry Authors: Brill-Karniely Y, Ideses Y, Bernheim-Groswasser A, Ben-Shaul A Tags: Chemphyschem Source Type: journals

Theoretical Investigation on the Effect of Different Nitrogen Donors on Intramolecular SeN Interactions.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The effect of different donor nitrogen atoms on the strength and nature of intramolecular SeN interactions is evaluated for organoselenium compounds having N,N-dimethylaminomethyl (dime), oxazoline (oxa) and pyridyl (py) substituents. Quantum chemical calculations on three series of compounds [2-(dime)C(6)H(4)SeX (1 a-g), 2-(oxa)C(6)H(4)SeX (2 a-g), 2-(py)C(6)H(4)SeX (3 a-g); X=Cl, Br, OH, CN, SPh, SePh, CH(3)] at the B3LYP/6-31G(d) level show that the stability of different conformers depends on the strength of intramolecular nonbonded SeN interactions. Natural bond orbital (NBO), NBO deletion and atoms in molecules (...
Source: Chemphyschem - October 21, 2009 Category: Chemistry Authors: Sarma BK, Mugesh G Tags: Chemphyschem Source Type: journals

Coupled Modulated Bilayers: A Phenomenological Model.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We propose a model addressing the coupling mechanism between two spatially modulated monolayers. We obtain the mean-field phase diagrams of coupled bilayers when the two monolayers have the same preferred modulation wavelength. Various combinations of the monolayer modulated phases are obtained and their relative stability is calculated. Due to the coupling, a spatial modulation in one of the monolayers induces a similar periodic structure in the second one. We have also performed numerical simulations for the case when the two monolayers have different modulation wavelengths. Complex patterns may arise from the frustr...
Source: Chemphyschem - October 21, 2009 Category: Chemistry Authors: Hirose Y, Komura S, Andelman D Tags: Chemphyschem Source Type: journals

Energy Transport along Conjugated Polymer Chains with Extended Radiative Lifetimes: A Theoretical Study.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The ability to improve exciton diffusion lengths is a key issue in optimizing many opto-electronic devices based on conjugated polymers. On the basis of quantum-chemical calculations, we investigate a strategy consisting of extending the radiative lifetime of energy carriers through incorporation along the polymer backbone of repeating units with forbidden optical transition. The results obtained for poly(p-phenylenebutadiyne), PPE, and poly(p-triphenylenebutadiyne), PTPE, show that the larger number of hops performed by the electronic excitations during their lifetime in PTPE is compensated by the smaller hopping leng...
Source: Chemphyschem - October 19, 2009 Category: Chemistry Authors: Van Averbeke B, Beljonne D Tags: Chemphyschem Source Type: journals

Recombination of Photogenerated Lophyl Radicals in Imidazolium-Based Ionic Liquids.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Laser flash photolysis is applied to study the recombination reaction of lophyl radicals in ionic liquids in comparison with dimethylsulfoxide as an example of a traditional organic solvent. The latter exhibits a similar micropolarity as the ionic liquids. The ionic liquids investigated are 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (1), 1-hexyl-3-methylimidazolium hexafluorophosphate (2), and 1-butyl-3-methylimidazolium tetafluoroborate (3). The recombination of the photolytic generated lophyl radicals occur significantly faster in the ionic liquids than expected from their macroscopic viscosities a...
Source: Chemphyschem - October 19, 2009 Category: Chemistry Authors: Strehmel V, Wishart JF, Polyansky DE, Strehmel B Tags: Chemphyschem Source Type: journals

DNA Condensation by Field-Induced Non-Equilibrium Noise.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
DNA molecules under good solvent conditions condense when subjected to strong AC electrical fields. It is shown that AC electrical fields couple charge fluctuations to molecular shape fluctuations, which produces a non-equilibrium noise source that can dominate over equilibrium thermal noise in the long-wavelength limit. The field-induced excess charge fluctuations amplify the Asakura-Oosawa fluctuation attraction force between neighboring chains, providing a mechanism for field-induced DNA condensation. PMID: 19839022 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 15, 2009 Category: Chemistry Authors: Bruinsma RF, Riehn R Tags: Chemphyschem Source Type: journals

Adsorption of Large Organic Molecules on Clean and Hydroxylated Rutile TiO(2)(110) Surfaces.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Behavior of large organic molecules equipped with spacer groups (Violet Landers, VL) on the TiO(2)(110)-(1x1) surfaces is investigated by means of high-resolution scanning tunneling microscopy (STM). Two distinct adsorption geometries are observed. We demonstrate that the molecule adsorption morphology can be alternated by well-controlled STM tip-induced manipulation. It is used to probe the mobility of molecules and reveals locking in one of the analyzed adsorption sites, thus allow to enhance or reduce the mobility along the [001] direction. Field induced hydrogen desorption is used to perform lateral STM manipulatio...
Source: Chemphyschem - October 15, 2009 Category: Chemistry Authors: Godlewski S, Tekiel A, Budzioch J, Gourdon A, Prauzner-Bechcicki JS, Szymonski M Tags: Chemphyschem Source Type: journals

Stable Blue- and Green-Emitting Zinc Oxide from Ionic Liquid Crystal Precursors.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19834929 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 14, 2009 Category: Chemistry Authors: Wang QT, Wang XB, Lou WJ, Hao JC Tags: Chemphyschem Source Type: journals

High-Quality Covalently Grafting Hemoglobin on Gold Electrodes: Characterization, Redox Thermodynamics and Bio-electrocatalysis.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Herein, we report a versatile surface chemistry methodology to covalently immobilize ligands and proteins to self-assembled monolayers (SAMs) on gold electrode. The strategy is based on two steps: 1) the coupling of soluble azido-PEG-amimo ligand with an alkynyl-terminated monolayer via click reaction and 2) covalent immobilization hemoglobin (Hb) to the amine-terminated ligand via carbodiimide reaction. Surface-enhanced Raman scattering spectroscopy (SERS), atomic force microscopy (AFM), reflection absorption infrared spectroscopy (RAIR) and cyclic voltammetry are used to characterize the model interfacial reactions. ...
Source: Chemphyschem - October 14, 2009 Category: Chemistry Authors: Tian Y, Ran Q, Xu J, Xian Y, Peng R, Jin L Tags: Chemphyschem Source Type: journals

Polarized Infrared Spectra of the H(D) Bond in 2-Thiophenic Acid Crystals: A Spectroscopic and Computational Study.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Polarized IR spectra of the hydrogen bond in 2-thiophenic acid crystals, isotopically neat and of mixed H/D isotopic content, are measured at 298 and 77 K in the "residual" nuO--H and nuO--D band frequency ranges. This crystalline system provides spectra in these band frequency ranges that differ considerably in intensity distribution from the spectra of other H-bonded centrosymmetric dimeric species. This change in the spectral properties of the crystals is probably due to the influence of the sulfur atoms from the thiophene aromatic rings, which are directly linked to the (COOH)2 or (COOD)2 cycles. The magnitude of t...
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: Rekik N, Ghalla H, Flakus HT, Jabłońska M, Blaise P, Oujia B Tags: Chemphyschem Source Type: journals

Structural Features of Interacting Complementary Liposomes Promoting Formation of Multicompartment Structures.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The structural features of complementary liposomes and factors favoring formation of multicompartment systems are investigated. Specifically, liposomal formulations consisting of PEGylated unilamellar liposomes with guanidinium moieties located at the distal end of polyethylene glycol (PEG) chains interact with complementary multilamellar liposomes bearing phosphate moieties. Furthermore, the number of PEG chains attached to the unilamellar interface of the liposomes is enhanced by incorporating PEGylated cholesterol in their bilayer. While molecular recognition of the liposomes is the driving force for initiating mult...
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: Sideratou Z, Sterioti N, Tsiourvas D, Paleos CM Tags: Chemphyschem Source Type: journals

STM and DFT Investigations of Isolated Porphyrin on a Silicon-Based Semiconductor at Room Temperature.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19830765 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: El Garah M, Makoudi Y, Palmino F, Duverger E, Sonnet P, Chaput L, Gourdon A, Cherioux F Tags: Chemphyschem Source Type: journals

Quantum Mechanical Dynamics of Charge Transfer in Ubiquitin in Aqueous Solution.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19830766 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: Anisimov VM, Bugaenko VL, Cavasotto CN Tags: Chemphyschem Source Type: journals

Theoretical Study of the Interplay between Lithium Bond and Hydrogen Bond in Complexes Involved with HLi and HCN.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The lithium- and hydrogen-bonded complex of HLi--NCH--NCH is studied with ab initio calculations. The optimized structure, vibrational frequencies, and binding energy are calculated at the MP2 level with 6-311++G(2d,2p) basis set. The interplay between lithium bonding and hydrogen bonding in the complex is investigated with these properties. The effect of lithium bonding on the properties of hydrogen bonding is larger than that of hydrogen bonding on the properties of lithium bonding. In the trimer, the binding energies are increased by about 19 % and 61 % for the lithium and hydrogen bonds, respectively. A big coopera...
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: Li Q, Hu T, An X, Li W, Cheng J, Gong B, Sun J Tags: Chemphyschem Source Type: journals

Different Catalytic Effects of a Single Water Molecule: The Gas-Phase Reaction of Formic Acid with Hydroxyl Radical in Water Vapor.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The effect of a single water molecule on the reaction mechanism of the gas-phase reaction between formic acid and the hydroxyl radical was investigated with high-level quantum mechanical calculations using DFT-B3LYP, MP2 and CCSD(T) theoretical approaches in concert with the 6-311+G(2df,2p) and aug-cc-pVTZ basis sets. The reaction between HCOOH and HO has a very complex mechanism involving a proton-coupled electron transfer process (pcet), two hydrogen-atom transfer reactions (hat) and a double proton transfer process (dpt). The hydroxyl radical predominantly abstracts the acidic hydrogen of formic acid through a pcet ...
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: Anglada JM, Gonzalez J Tags: Chemphyschem Source Type: journals

Phase-Transition- and Dissipation-Driven Budding in Lipid Vesicles.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Membrane budding has been extensively studied as an equilibrium process attributed to the formation of coexisting domains or changes in the vesicle area-to-volume ratio (reduced volume). In contrast, non-equilibrium budding remains experimentally widely unexplored, especially when timescales fall well below the characteristic diffusion time of lipids, ${\tau }$. We show that localized mechanical perturbations, initiated by driving giant unilamellar vesicles (GUVs) through their lipid main phase transition from the gel to the fluid phase, lead to the immediate formation of rapidly growing, localized, non-equilibrium bud...
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: Franke T, Leirer CT, Wixforth A, Dan N, Schneider MF Tags: Chemphyschem Source Type: journals

Towards Molecular Temperature Programmers for Variable-Temperature Kinetic Experiments.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19830770 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: Alibrandi G, Lister DG, Lo Vecchio C Tags: Chemphyschem Source Type: journals

Hydrogen-Bonding Fingerprints in Electronic States of Two-Dimensional Supramolecular Assemblies.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PMID: 19830771 [PubMed - as supplied by publisher] (Source: Chemphyschem)
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: Gonzalez-Lakunza N, Cañas-Ventura ME, Ruffieux P, Rieger R, Müllen K, Fasel R, Arnau A Tags: Chemphyschem Source Type: journals

Adsorption Mechanism of Polypeptides and Their Location at Hydrophobic Interfaces.Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The adhesion of polypeptides and proteins at interfaces is important for a wide variety of systems-from the adhesion onto vessels during their production process over functional coatings to protein-membrane interactions in single cells. Herein, we apply an atomic-force-microscopy-based single-molecule method and poly-D-tyrosine to determine the adhesion strength and location of polypeptides at interfaces. Surprisingly, the support (solid, liquid or gas) hardly influences the adhesion in an aqueous environment, while the addition of ethanol to the solvent cuts the adhesion in half. These findings allow us to propose tha...
Source: Chemphyschem - October 13, 2009 Category: Chemistry Authors: Pirzer T, Hugel T Tags: Chemphyschem Source Type: journals